The main differences between must and have to are:
Must means "really should or else it will be bad for you", it expresses an obligation forced by the speaker.
Have / Has to expresses general obligations. When we are talking about another person's obligation we use have to, too. We use have to when the obligation comes from outside.
See Modals Chart / Modals Exercises
Affirmative Form | Subject + must + verb + complement |
You must come home before 8 o'clock. | |
Negative Form | Subject + mustn't + verb + complement |
You mustn't come home before 8 o'clock. | |
Question Form | Must + subject + verb + complement ? |
Must you come home before 8 o'clock? | |
Negative Question Form | Mustn't + subject + verb + complement ? |
Mustn't you come home before 8 o'clock? |
Affirmative Form | Subject + has to / have to + verb + complement |
He has to take his medicine. | |
Negative Form | Subject + don't have to / doesn't have to + verb + complement. |
He doesn't have to take his medicine. | |
Question Form | Does / Do + subject + have to + verb + complement ? |
Does he have to take his medicine? | |
Negative Question | Doesn't / Don't + subject + have to + verb + complement ? |
Doesn't he have to take his medicine? |
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